I have a game, that follows this flow: SplashScreen -> Menu -> Level1 -> Menu
The first time the menu is opened, everything is fine:

After I come back from the game (I checked, and the same amount of objects are on the scene both times), this is what I get:

NOTE: This is on ios devices, both ipod touch & ipad. I'm using Unity 5.0 & NGUI 3.8